J/A+A/469/713ivo://CDS.VizieR/J/A+A/469/713doi:10.26093/cds/vizier.34690713CDSMedhi B.J.Messina S.Parihar P.S.Pagano I.Muneer S.Duorah K.2023-02-04T17:45:07Z2007-08-19T13:59:19ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frlate-type-starsstellar-atmospheresmorgan-keenan-classificationIn this paper we report the results of the spectroscopic survey we carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission. We give an accurate MK classification of all targets, which is valuable information on both the main CoRoT project and additional science programs, by means of cross-correlation with MK standard stars, by using artificial neural networks. The presence or absence of excess H{alpha} emission, determined using spectral subtraction technique, is used to characterize the chromospheric activity level. In most cases our MK classification agrees with the spectral classification reported in the SIMBAD database; however, there are a few stars that are found to have very different MK classes. Our survey reveals that ~7% of late-type stars in our sample indeed possess a very active chromosphere. The measured H{alpha} excess and the presence of the 6708{AA}, Li line allow us to confirm the membership of 5 targets in the young open cluster NGC 2264.2007A&A...469..713Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/469/713CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/corot : CoRoT observation log (CoRoT, 2009)J/MNRAS/298/332 : Chromospheric activity-age relation (Rocha-Pinto+ 1998)J/A+A/379/976 : Moving groups late-type stars EW + fluxes (Montes+ 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/469/713https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/469/713http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/469/713https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/469/713https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/469/713http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/469/713GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/469/713/catalog (Positions, magnitudes and spectral types of the studied stars (tables 1, 2, 3 and 5 of paper), positions fixed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/469/713/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/469/713/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/469/713/catalog?GETtext/xml+votable180.050000true93.0023756.78308330.0055555555555555565/5561 6/20990 21462 21659 21676 21680 21682 21691 21731 21742 22027 22036-22037 22039-22040 22045-22047 22071 22090 22094 22110 22112 22114-22116 22118 22121 22123 22125 22127 22134 22137 22139 22145 22148 22159 22174 22209 22213-22214 22218-22219 22222 22240-22241 22243 22249 22251-22254 22257 22263-22264 22269 22271 22315 22322 22328 22420 23583 23618-23619 23621-23623 23636-23637 23639 29549 29563-29564 29655 29878 29926 30214-30215 30217 30221 30227 30242 30245 30307-30308 30331 30343-30344 30357 30363 30394 30407 30416 30419 30438 30440 30452 30455 30459 30499 30501 30503 30512 30514-30515 30521-30524 30526 30592 30604 30606 30612 30614 30616-30617 30619 31772 31774 31814 31821 31828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/469/713?format=asciiOpticaldefaultJ/A+A/469/713/catalogPositions, magnitudes and spectral types of the studied stars (tables 1, 2, 3 and 5 of paper), positions fixedSimbadNameSimbad column added by the CDSmeta.idcharnullableRAoOriginal right Ascension J2000pos.eq.rarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSamBright star (BS) or weak star (WS) samplemeta.idcharSeq[1/180] Serial numbermeta.idintNameStar's namemeta.id;meta.maincharDateObservation datetime.epoch;obsnullableVmagV-band magnitudemagphot.mag;em.opt.VfloatSpT.SMK spectral type from SIMBADsrc.spTypecharSpType1Spectral type from cross-correlation (CC) techniquestat.correlationcharR1[0/1] Linear correlation coefficient related to SpType1stat.correlationfloatSpType2Spectral type from ANN (1)src.spTypecharR2[0/1] Linear correlation coefficient related to SpType2stat.correlationfloatVMAG? Absolute magnitudemagphys.magAbsfloatnullableE_VMAG? Error on absolute magnitude (upper limit)magstat.error;stat.maxfloatnullablee_VMAG? Error on absolute magnitude (lower limit)magstat.errorfloatnullable(B-V)0? Dereddened B-V color indexmagphot.color;em.opt.B;em.opt.VfloatnullableE(B-V)? B-V color excessmagphot.color.excessfloatnullablee_E(B-V)? Error on B-V color excessmagstat.errorfloatnullableSpTypeFinally assigned MK spectral typesrc.spTypecharNotesNote on metallicity, X-ray emission and evolution stagemeta.noteDEoOriginal declination J2000pos.eq.decRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mains[TUM] Source of position: T=Tycho-2 (I/259), U=UCAC2 (I/289), M=2MASS-PSC (II/246)meta.ref;poscharComComments concerning this entry (from B. Skiff)meta.notechar